Assessment of the suitability of temperature and relative humidity for rice cultivation in rainfed lowland paddy fields in Kurunegala district
Climatic suitability analysis is a prerequisite to achieve optimum utilization of the available resources in rainfed rice cultivation. Therefore, a study was conducted to assess the climatic factors and to map their suitability for rainfed paddy farming in Mahananeriya, Ibbagamuwa and Alawwa ASC reg...
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| Format: | Article |
| Language: | English |
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Postgraduate Institute of Agriculture, University of Peradeniya
2016-08-01
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| Series: | Tropical Agricultural Research |
| Subjects: | |
| Online Access: | https://tar.sljol.info/articles/8214 |
| _version_ | 1818159558457032704 |
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| author | W. M. U. K. Rathnayake R. P. De Silva N. D. K. Dayawansa |
| author_facet | W. M. U. K. Rathnayake R. P. De Silva N. D. K. Dayawansa |
| author_sort | W. M. U. K. Rathnayake |
| collection | DOAJ |
| description | Climatic suitability analysis is a prerequisite to achieve optimum utilization of the available resources in rainfed rice cultivation. Therefore, a study was conducted to assess the climatic factors and to map their suitability for rainfed paddy farming in Mahananeriya, Ibbagamuwa and Alawwa ASC regions representing dry, Intermediate and wet areas of Kurunegala District in <span style="text-decoration: underline;">Yala</span> and <span style="text-decoration: underline;">Maha</span> seasons using Geo-Informatics. Daily weather data of maximum temperature, minimum temperature, and relative humidity for 10 years were averaged on a weekly basis. The IDW interpolation technique was used to prepare thematic maps. The maximum temperature was grouped as 27<sup>0</sup>C - 32<sup>0</sup>C, 32<sup>0</sup>C - 35<sup>0</sup>C, and more than 35<sup>0</sup>C. The minimum temperature was grouped as less than 19<sup>0</sup>C and more than 19<sup>0</sup>C. Relative humidity was grouped into three classes as 60% - 80%, 80 % - 85% and more than 85%. The temperature maps and relative humidity maps were overlaid with the weighted sum technique giving weights as 0.75 and 0.25 respectively to produce suitability maps for rice cultivation on weekly basis throughout the year. Results show that minimum temperature is not in the critical level for rice cultivation within Kurunegala District throughout the year. Maximum temperature is optimum (27<sup>0</sup>C - 32<sup>0</sup>C) for rice cultivation in all three ASC regions during Maha season and in Ibbagamuwa and Alawwa ASCs during Yala season. Relative humidity in all three ASCs is more than 85% during <span style="text-decoration: underline;">Maha</span> season and in between 80 % and 85 % during <span style="text-decoration: underline;">Yala</span> season. Considering temperature and relative humidity, whole rainfed paddy lands in Ibbagamuwa and Alawwa ASCs are highly suitable for rice cultivation in the <span style="text-decoration: underline;">Yala</span> season. Rainfed paddy lands in all three ASCs are in suitable category in terms of the suitability of temperature and relative humidity during <span style="text-decoration: underline;">Maha</span> season. Spatial variations of the suitability of the interactive outcome of the maximum temperature and relative humidity appear among Mahananeriya, Ibbagamuwa and Alawwa ASC regions representing Dry (DL1b), Intermediate (IL1a) and Wet (WL3) zones in Kurunegala District. Intra regional spatial variations are very rare. Temporal variations among two seasons of <span style="text-decoration: underline;">Yala</span> and <span style="text-decoration: underline;">Maha</span> and the intra variations within the seasons also evidence. Date of seed sowing or crop establishment should be aligned according to the suitability levels matching with the flowering and grain filling stages of rice. |
| first_indexed | 2024-12-11T15:47:54Z |
| format | Article |
| id | doaj.art-8d784f4303434ed6b38668fbf8d2daf6 |
| institution | Directory Open Access Journal |
| issn | 1016-1422 |
| language | English |
| last_indexed | 2024-12-11T15:47:54Z |
| publishDate | 2016-08-01 |
| publisher | Postgraduate Institute of Agriculture, University of Peradeniya |
| record_format | Article |
| series | Tropical Agricultural Research |
| spelling | doaj.art-8d784f4303434ed6b38668fbf8d2daf62022-12-22T00:59:39ZengPostgraduate Institute of Agriculture, University of PeradeniyaTropical Agricultural Research1016-14222016-08-0127410.4038/tar.v27i4.82146123Assessment of the suitability of temperature and relative humidity for rice cultivation in rainfed lowland paddy fields in Kurunegala districtW. M. U. K. Rathnayake0R. P. De Silva1N. D. K. Dayawansa2University of PeradeniyaUniversity of Peradeniya, PeradeniyaUniversity of Peradeniya, PeradeniyaClimatic suitability analysis is a prerequisite to achieve optimum utilization of the available resources in rainfed rice cultivation. Therefore, a study was conducted to assess the climatic factors and to map their suitability for rainfed paddy farming in Mahananeriya, Ibbagamuwa and Alawwa ASC regions representing dry, Intermediate and wet areas of Kurunegala District in <span style="text-decoration: underline;">Yala</span> and <span style="text-decoration: underline;">Maha</span> seasons using Geo-Informatics. Daily weather data of maximum temperature, minimum temperature, and relative humidity for 10 years were averaged on a weekly basis. The IDW interpolation technique was used to prepare thematic maps. The maximum temperature was grouped as 27<sup>0</sup>C - 32<sup>0</sup>C, 32<sup>0</sup>C - 35<sup>0</sup>C, and more than 35<sup>0</sup>C. The minimum temperature was grouped as less than 19<sup>0</sup>C and more than 19<sup>0</sup>C. Relative humidity was grouped into three classes as 60% - 80%, 80 % - 85% and more than 85%. The temperature maps and relative humidity maps were overlaid with the weighted sum technique giving weights as 0.75 and 0.25 respectively to produce suitability maps for rice cultivation on weekly basis throughout the year. Results show that minimum temperature is not in the critical level for rice cultivation within Kurunegala District throughout the year. Maximum temperature is optimum (27<sup>0</sup>C - 32<sup>0</sup>C) for rice cultivation in all three ASC regions during Maha season and in Ibbagamuwa and Alawwa ASCs during Yala season. Relative humidity in all three ASCs is more than 85% during <span style="text-decoration: underline;">Maha</span> season and in between 80 % and 85 % during <span style="text-decoration: underline;">Yala</span> season. Considering temperature and relative humidity, whole rainfed paddy lands in Ibbagamuwa and Alawwa ASCs are highly suitable for rice cultivation in the <span style="text-decoration: underline;">Yala</span> season. Rainfed paddy lands in all three ASCs are in suitable category in terms of the suitability of temperature and relative humidity during <span style="text-decoration: underline;">Maha</span> season. Spatial variations of the suitability of the interactive outcome of the maximum temperature and relative humidity appear among Mahananeriya, Ibbagamuwa and Alawwa ASC regions representing Dry (DL1b), Intermediate (IL1a) and Wet (WL3) zones in Kurunegala District. Intra regional spatial variations are very rare. Temporal variations among two seasons of <span style="text-decoration: underline;">Yala</span> and <span style="text-decoration: underline;">Maha</span> and the intra variations within the seasons also evidence. Date of seed sowing or crop establishment should be aligned according to the suitability levels matching with the flowering and grain filling stages of rice.https://tar.sljol.info/articles/8214rice cultivation, rainfed lowland fields, relative humidity, temperature |
| spellingShingle | W. M. U. K. Rathnayake R. P. De Silva N. D. K. Dayawansa Assessment of the suitability of temperature and relative humidity for rice cultivation in rainfed lowland paddy fields in Kurunegala district Tropical Agricultural Research rice cultivation, rainfed lowland fields, relative humidity, temperature |
| title | Assessment of the suitability of temperature and relative humidity for rice cultivation in rainfed lowland paddy fields in Kurunegala district |
| title_full | Assessment of the suitability of temperature and relative humidity for rice cultivation in rainfed lowland paddy fields in Kurunegala district |
| title_fullStr | Assessment of the suitability of temperature and relative humidity for rice cultivation in rainfed lowland paddy fields in Kurunegala district |
| title_full_unstemmed | Assessment of the suitability of temperature and relative humidity for rice cultivation in rainfed lowland paddy fields in Kurunegala district |
| title_short | Assessment of the suitability of temperature and relative humidity for rice cultivation in rainfed lowland paddy fields in Kurunegala district |
| title_sort | assessment of the suitability of temperature and relative humidity for rice cultivation in rainfed lowland paddy fields in kurunegala district |
| topic | rice cultivation, rainfed lowland fields, relative humidity, temperature |
| url | https://tar.sljol.info/articles/8214 |
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